Electrophotographic carrier and use thereof

a technology of electrophotographic carrier and developer, which is applied in the direction of electrographic process apparatus, instruments, corona discharge, etc., can solve the problems of difficult to charge toner stably, reduced image density, and complicated structure of developing devices used therefor, and achieve excellent image density, less fogging, and high quality

Active Publication Date: 2012-07-10
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]An objective of the present invention is to provide such an electrophotographic carrier that allows formation of high quality images with excellent image density (especially when used for developing solid images) and less fogging.

Problems solved by technology

However, they have a problem of being difficult to charge toner stably, etc.
On the other hand, since two-component developers need to be stirred before use in order to homogeneously mix toner and carrier, they have a problem that developing devices used therefor have a complicated structure with a mixer or the like.
Thus, they have a problem that, when used for developing solid images, the image density can be decreased.
However, such a coated carrier has a problem that the decreased carrier resistance makes it easier for electric charge to transfer from the photoconductor drum surface to the carrier so as to erase the latent image on the drum surface, and / or for the carrier to travel onto the drum surface so as to cause blurring or fogging in the formed images.

Method used

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  • Electrophotographic carrier and use thereof
  • Electrophotographic carrier and use thereof
  • Electrophotographic carrier and use thereof

Examples

Experimental program
Comparison scheme
Effect test

examples

[0165]The present invention will better understood with reference to the following examples, which are intended only to illustrate the invention, but are not intended to limit the scope of the invention in any way.

Carrier

[0166]The carriers used in the following Examples and Comparative Examples were prepared according to the following manner.

[0167]Ferrite materials (available from Kanto Denka Kogyo Co., Ltd., Japan) were mixed in a ball mills, and then calcinated at a temperature of 900° C. in a rotary kiln. The calcinated particles were milled in a wet mill (using steel balls as milling medium) so as to give fine particles having an average diameter of 1 μm or less. The resulting powder was granulated with a spray-dryer. The granulates were baited at a temperature of 1300° C., and then crushed so as to obtain ferrite core particles having a volume average particle size of 43 μm and a volume resistivity of 1×109 Ω·m.

[0168]For forming the first resin layer, a coating liquid S1 was pr...

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PUM

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Abstract

The present invention provides an electrophotographic carrier which includes a core particle, a first resin layer containing a charge-generating material for coating the core particle, and a second resin layer containing a hole-transporting material for coating the first resin layer. The invention also provides a two-component developer comprising said carrier, and an image-forming process and apparatus using said developer. According to the invention, high quality images can be formed, with excellent image density (especially when developing solid images) and less fogging.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is related to Japanese Patent Application No. 2008-167402 filed on Jun. 26, 2008, whose priority is claimed under 35 USC §119, the disclosure of which is incorporated herein in its entirety by reference for any and all purposes.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an electrophotographic carrier, a two-component developer comprising the carrier, and an electrophotographic image-forming process and apparatus using said developer. In particular, the invention relates to an electrophotographic carrier comprising a core particle and resin layers for coating the core particle, a two-component developer comprising the carrier, and an image-forming process and apparatus, such as copiers, printers, facsimile machines and the like, using said developer.[0004]2. Description of the Related Art[0005]In electrophotographic image-forming apparatuses, generally, an image is forme...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G03G9/00
CPCG03G9/1136G03G9/1138G03G15/08
Inventor MITAMURA, KEIGO
Owner SHARP KK
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